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Sample v$waitclassmetric data 

The DBA might be interested in seeing what wait classes 6, 7 and 9 represent.  Querying the v$system_wait_class view is one way to identify what the wait classes represent.  This view has a historical rollup for the entire time the instance has been up, but it also provides a way to change wait_class# into the name of that class.  wait_class_info.sql is a simple query that could easily be plugged into waitclassmetric.sql to include the name of the wait class in addition to the number.  Sample output of this script is shown in Figure 8.13.

* wait_class_info.sql 

-- *************************************************

-- Copyright © 2003 by Rampant TechPress

-- This script is free for non-commercial purposes

-- with no warranties.  Use at your own risk.

--

-- To license this script for a commercial purpose,

-- contact rtp AT rampant.cc

-- ************************************************* 

select

   wait_class# ,

   wait_class

from

   v$system_wait_class

where:

See Code Depot


The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Iinterface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert 

http://www.rampant-books.com/book_2004_2_wait_tuning.htm

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